Dear friends,
after a lot of different tryes, I suppose that one of integrated circuit
doesn't work.
If I connect my radios directly to the com port everything is ok, but as I
go through the keyer no connection is shown both if plugged or not with DC
power.
Now how to understand which of these components is broken?
I think that or MAX202 or the original chip 10.19 or 74164 part is damaged.
I don't have spare parts, so I must identify which one is to be changed. How
to do?
By the way, thanks to all friend answering at my first message.
Gino
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